(1):
(v. i.) To lie below or under.
(2):
(n.) See Underlay, n., 1.
(3):
(v. t.) To be subject or amenable to.
(4):
(v. t.) To be at the basis of; to form the foundation of; to support; as, a doctrine underlying a theory.
(5):
(v. t.) To lie under; to rest beneath; to be situated under; as, a stratum of clay underlies the surface gravel.